Fill a microwaveable bowl with 1-2 cups of water and add a dash of vinegar (about a tablespoon or two). Put the bowl in the microwave, shut the door, and turn it on for 5 minutes. Then take a cloth and wipe down the inside of the microwave; the dirt and food will come right off! WORKS SO WELL!
How to clean a microwave- 1 cup vinegar + 1 cup hot water + 10 minutes in the microwave = steam clean. Pinner says, "This totally works, there will not be anymore scum or funky smells."